Photographic device



Y April 2s, 192s.

1,535,606 L. HORST PHoToenAPHzc': DEVICE ff Filed June 21". 1922 d Jnvenfor:

Patented Apr. 28, 1925.

UNITED STATES LUDWIG HORST, OF BERLIN-WILMERSDORF, GERMANY.

PHOTOGRAPHIC DEVICE.

Application filed .Tune 21, 1922.

To .f/ZZ vwhom z'z may concern:

Be it known that I, LUDwic. I-Ions'r, a citizen ot the Republic ot`Germany, residing at Berlin-lVilmersdort, Germany, have invented certainneu7 and useful Improvements in Photographic Devices; and I do herebydeclare the following to be a full, clear, and exact description ot theinvention.

The present invention relates to a device t'or the production otphotographs in natural coloursl especially for kinematographic purposes.The characteristic. feature of the invention consists in that the raysof light are directed by means otl a relatively large collecting mirrorupon the three successive .bjective-mirrors which are decreasing in v Av. size by steps. On acocunt ot the small kinematographic pictures theJfocal distance is short. rI`hese short distances show the disadvantagethat the niountings otl the mirrors or the silver-plated strips are alsophoto-` graphed. Therefore, it is necessary to bring the mirrors,movable towards all directions, directly in Jfront of the lens of theobjective. In order to obtain a. large angle of picture, it is necessaryto provide a very large mirror. The objective-mirrors are stepped insize in such a way that the uppermost mirror is larger than the middleone and the latter larger again than the rear mirror. By such graduationof size in connection with the large collective mirror the photographingot the mountings of the mirrors will not take place, though theperspective plane will be. increased respectively.

Supposedbtor instance the mirror close to the iirst objective be just asbig as the collecting mirror, in such case the back side of themountings of the collecting mirror would be photographed by the firstobjective. This also applies to the other objectives and mirrors.

In order to prevent the formation of double images, wedge-shaped prismsare provided for the uppermost and middle objective.

The distribution of light without a blind before the objective may beeti'ected in such a manner that the lower angle of the prism in themiddle mirror is transparently silverplated.

Serial N0. 569,925.

A mode of construction according to the present invention is shown inthe drawing In which- Fig. l shows a cross-section ot the device;

Fig. 2 a front view, and

Fig. 3 an objective-mirror.

l designates the collecting mirror, Q, f-i the objective-mirrors and 5the objectives. Both the collecting mirror and the objective-mirrors aremovable, namely each mirror is mounted by means of pivots 'T in a frame,which latter is turnable about a pin G (Fig. 3). The objective-mirrorsif, 3, l are stepped as regards both their breadth and height (Fig. 2).The objective-mirrors are arranged immediately in front of theobjectives in order to produce in connection with the large collectingmirror the largest perspective plane imaginable for the bottommostobjective.

I claim:

l. A device for producing series ot colored pictures in natural colorstree of any parallaxes as regards space and time, especially forkinematographic purposes, comprising a relatively large movablecollecting mirror (l) and three objective-mirrors (i), 3, l) partiallyreflecting and partially transmitting turnable in all directions,arranged in succession immediately in front ot the objectives anddecreasing by steps as regards their length and breadth.

2. In a device Jfor the production ot pictures in natural colors, freefrom time and space parallax, a relatively large collecting mirror toinclude a wide angle of incidence, three objectives, and threeuniversally movable objective mirrors therefor one behind the other inline from but at an angle to the collecting mirror and directly infrontof the objectives, the mirrors being partially reflecting andpartially transmitting.

3. In a short focus photographic device of the class described, arelatively large col- Iecting mirror and a plurality of universallymovable objective mirrors, partially reflecting and partiallytransparent, the objective mirrors being on a line from the collectingmirror and graduated downwardly in size both as to length and width.

able objective mirrors arranged and adjustable in line one behind tlieother, pariiallY ref'lertingr and partially transmitting` the mirrors int'ront ot' the last one being provided with Wedge shaped prisms toprevent tlie formation of double images. In testimony that I claim theforegoing as my invention I have signed my name.

LUDWIG HORST.

